Standard for Fire Safety in Rapid Transit Systems - Singapore Civil ...

(h) 850mm for doors and gates, and
(i) 500mm for underplatform services ducts.
2.2.5.5 The maximum length of dead-end shall not exceed 15m
(non-sprinklered) or 20m (sprinklered).
2.2.5.6 EXIT STAIRCASE
Dead-end
(a) Internal Exit Staircase Internal exit
staircase
(i) Except as permitted in Cl.2.2.3.2 an internal
exit staircase which serves as the required exit
of the station shall be enclosed with
construction complying with the provisions of
Cl.2.3.8, and
(ii) Where an internal exit staircase is directly
approached from an external exit passageway or
external corridor, it shall not be necessary to
provide such enclosure between the staircase
and the external exit passageway or external
corridor provided no unprotected openings are
located within 3m from the exit staircase, and
(iii) There shall be no unprotected openings of
occupancy area within 1.5m horizontally or
within 3m vertically below any part of the
ventilation openings located in the external wall
of the internal exit staircase.
(b) External Exit Staircase External exit
staircase
(i) External exit staircase may be used as required
exit in lieu of internal exit staircase provided it
complies with the requirements of exit staircase,
except for enclosure of an internal staircase, and
(ii) There shall be no unprotected openings within 3
m horizontally or within 3m vertically below
any part of the external exit staircase.
(c) All exit staircases shall discharge at ground level
directly into a safe exterior open space.
(d) The minimum width and capacity of exit staircases
shall be in accordance with Cl.2.2.3.7, Cl.2.2.4.6 and
Cl.2.2.5.4.
Discharge
Standard for Fire Safety in Rapid Transit Systems 28